cromartie key

gistfile1.c

#include <stdio.h>
#include <string.h>
#define mid(A,B,C) ((A >= B && A <= C) || (A >= C && A <= B)?A:(((B >= A && B <= C) || (B >= C && B <= A))?B:C))
int main(int argc, char *argv[])
{
  char lock_up[80];
  char lock_down[80];
  char key[80];

  int lock_max,key_max;
  
  int i,j;
  int mid_code;

  fgets(lock_up,80,stdin);
  lock_up[strlen(lock_up)-1] = '\0';
  fgets(lock_down,80,stdin);
  lock_down[strlen(lock_down)-1] = '\0';
  fgets(key,80,stdin);
  key[strlen(key)-1] = '\0';

  lock_max = strlen(lock_up);
  key_max = strlen(key);


  for(i = -(key_max-1); i < lock_max; ++i) {
    for(j = 0; j < key_max; ++j) {
      if (((i+j) >= 0 && (i+j) < lock_max)) {
        mid_code = mid(lock_down[i+j],lock_up[i+j],key[j]);
        key[j] = mid_code;
      }
    }
  }

  printf("%s\n",key);
  return 0;
}